*{margin:0;padding:0;box-sizing:border-box}body,html{height:100%;width:100%}.whatsapp-button{animation:pulse 2s infinite}@keyframes pulse{0%{box-shadow:0 0 #25d366b3}70%{box-shadow:0 0 0 15px #25d36600}to{box-shadow:0 0 #25d36600}}.whatsapp-button:hover{animation:none}